Fluid handling – Pressure modulating relays or followers – Plural series units
Patent
1993-08-31
1995-08-08
Michalsky, Gerald A.
Fluid handling
Pressure modulating relays or followers
Plural series units
137 85, 137269, G05B 1150, G05D 1620
Patent
active
054390214
ABSTRACT:
An electro-pneumatic converter device with modular components and with supporting housing structure enabling the device to be readily convertible from a current to pressure positioner to a current to pressure transducer. A valve positioner with an enclosure having a housing, a modular base, and a separable field terminal box. A self contained cover mounted to the enclosure with no additional mounting components. A plastic pneumatic relay ultrasonically welded together to eliminate metal mounting parts and lower assembly time. Open channels in a housing surface cooperating with a gasket to provide fluid passageways between the housing and the modular base. Pressure gauges are removably mounted on a modular unit for location completely within the housing. A floating interconnect terminal board permits self-aligning of mating terminals as the modular unit is inserted into the housing. A supply biased pneumatic pressure relay has supply pressure channeled to the supply port and also to a supply bias cavity through a capillary hole.
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User's Manual for the Model 3311 "Current-to-Pressure (I/P) Transducer", Publication No. 4595, Rosemount Measurement Control Analytical Valves, Sept. 1990, pp. 3-2, 6-5.
Burlage Brian J.
Gaarder Barry L.
Good Stanley R.
Pauller Steven B.
Fisher Controls International Inc.
Michalsky Gerald A.
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